12 men can complete a work in 90 days 30 days after they started work 2 men left and 8 men joined Ho...........

Quantitative Aptitude ( CCS) Time and work

12 men can complete a work in 90 days. 30 days after they started work, 2 men left and 8 men joined. How many days will it take to complete the remaining work?

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Explanation:

Efficiency of 12 Men = 1/90
Work completed in 30 days = 30/90 = 1/3
Remaining work = 1 - 1/3 = 2/3
12×90=(18×Days)/(2/3)
12×90=(18×3)/2×Days
Days = 40 days